Are there any other build sheet locations within a 1969 vette 427 tri-pwr conv

I have customer with  a 1969 427 tri-pwr 4 sp conv that was purchased from the original owner without a build sheet due to a rearender in 1972 when the tank was replaced.The original owner still has thi repair slip for the accident including ins clame but still no docs on car as to the build sheet. This is too nice a car to make a toy out of , can any body give me a helping hand with this?